Your unhappiness doesn't help anyone else - and in fact, as I mentioned in another answer, happy people are more altruistically inclined. So happiness is not a selfish goal.

Don't let perfect be the enemy of good.

[S]tudies show that one of the best ways to lift your mood is to engineer an easy success, such as tackling a long-delayed chore.

If you want to feel safe, healthy, and hopeful, try to act as if you did feel that way. "Fake it 'till you feel it." maybe start with health -- try to walk energetically, speak energetically, do physical things.

Happy people make people happy, but I can’t make someone be happy, and no one else can make me happy.

A blog is something that, everyday there's a new thing and that's part of the fun of it, you're just constantly moving forward. A book really gives you more time to reflect and think hard on things very, very deep.

Feelings follow actions. If I'm feeling low, I deliberately act cheery, and I find myself actually feeling happier. If I'm feeling angry at someone, I do something thoughtful for her and my feelings toward her soften. This strategy is uncannily effective.